1 files changed, 1 insertions, 1 deletions
diff --git a/gc.c b/gc.c
index c75f8637c0..5f67bdec29 100644
--- a/gc.c
+++ b/gc.c
@@ -7672,7 +7672,7 @@ wmap_final_func(st_data_t *key, st_data_t *value, st_data_t arg, int existing)
 	return ST_DELETE;
     }
     if (j < i) {
-	ptr = ruby_sized_xrealloc2(ptr, j, sizeof(VALUE), i);
+	ptr = ruby_sized_xrealloc2(ptr, j + 1, sizeof(VALUE), i);
 	ptr[0] = j;
 	*value = (st_data_t)ptr;
     }